The city of Zanjan is located 320 km northwest of Tehran, it lies on an open valley about halfway along the main road and railway to Tabriz. With a present day population of 300.000, the construction of the city is attributed to Ardeshir I Sassanid king. Zanjan is administratively divided into three parts: the central part (the city itself), and two districts outside the city called Mahanshan and Tarom-e-olya.
Zanjan probably dates back to the Sassanid period. Conquered by the Muslims in the 7th century, obliterated by the Mongols and by Tamerlane in the 13 th and 14 th centuries, and having a vivid record in civilization, culture, arts and sciences.
The city is the centre of an agricultural zone with abundant wheat crops. Industries produce milled rice and flour, hand-woven cloth, metal ware, and carpets.